Dell PowerConnect 5448 User's Guide - Page 314

Modifying the LAG STP Parameters 1 Open the STP LAG Settings page. 2 Select a LAG from the Select a LAG drop-down menu. 3 Modify the fields as desired. 4 Click Apply Changes. The STP LAG parameters are modified, and the device is updated. Defining STP LAG Settings Using CLI Commands The following table summarizes the equivalent CLI commands for defining STP LAG settings. Table 7-21. STP LAG Settings CLI Commands CLI Command Description spanning-tree Enables spanning tree. spanning-tree disable Disables spanning tree on a specific LAG. spanning-tree cost cost Configures the spanning tree cost contribution of a LAG. spanning-tree port-priority priority Configures port priority. spanning-tree guard root Enables root guard on all the spanning tree instances on that interface. show spanning-tree [ethernet interface | Displays spanning tree configuration. port-channel port-channel-number] show spanning-tree [detail] [active | blockedports] Displays detailed spanning tree information on active or blocked ports. The following is an example of the CLI commands: console(config)# interface port-channel 1 console(config-if)# spanning-tree port-priority 16 Configuring Rapid Spanning Tree While Classic Spanning Tree guarantees preventing L2 forwarding loops in a general network topology, convergence can take up to 30-60 seconds. The convergence time is considered too long for many applications. When network topology allows, faster convergence may be possible. The Rapid Spanning Tree Protocol (RSTP) detects and uses of network topologies that provide faster convergence of the spanning tree, without creating forwarding loops. 314 Configuring Device Information